The following is a list of free cam chat sites that will auto match you with a random person.

https://en.wikipedia.org/wiki/Omegle

Omegle offers free no registration face to face chat with a twist – it randomly matches you with anyone who is online you can either skip them or chat with them. The site is often used for sex chat so expect nudity.

The site continues to have issues with bots and spam users capturing video by recording screens. If you happen to be in a sex chat situation with a user make sure you trust them. Also If you do not want your face and junk posted online do not include your face even with a user that you trust.

Other sites include Zumbl, Chatroulette,Tinychat, and Whisper